<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            height: 1500px;
        }
        
        .father {
            width: 800px;
            height: 800px;
            position: relative;
            margin: 0 auto;
        }
        
        .damao,
        .ermao {
            width: 800px;
            height: 800px;
            position: absolute;
            border: 1px solid peru;
            /* left: 0;
            top: 0; */
            border-radius: 50%;
            background: url("./R-C.jpg") no-repeat;
        }
        
        .damao {
            z-index: 1;
        }
        
        .damao {
            background: url("./R-C1.jpg") no-repeat;
            transition: all 1s;
            transform-origin: bottom;
        }
        
        .father:hover .damao {
            transform: rotateX(180deg);
        }
    </style>
</head>

<body>
    <div class="father">
        <div class="damao">

        </div>
        <div class="ermao">

        </div>
    </div>
</body>

</html>